package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;

import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String LOGIN_URL="https://api.weixin.qq.com/sns/jscode2session";



    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper usermapper;

    @Override
    public User login(UserLoginDTO code) {


        //下面请求微信登陆接口比较独立，弄成一个独立的方法
        String openid = getOpenid(code);

        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断是否是新用户
        User user= usermapper.getBYOpenid(openid);


        //新用户，为其完成注册
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now()).build();

            usermapper.insert(user);
        }


        return user;


    }

    private String getOpenid(UserLoginDTO code) {
        Map<String, String> map=new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code.getCode());
        map.put("grant_type","authorization_code");

        String json = HttpClientUtil.doGet(LOGIN_URL, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
